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RTADVD.CONF(5)		  FreeBSD File Formats Manual		RTADVD.CONF(5)

NAME
     rtadvd.conf -- config file	for router advertisement daemon

DESCRIPTION
     This file describes how the router	advertisement packets must be con-
     structed for each of the interfaces.

     As	described in rtadvd(8),	you do not have	to set this configuration file
     up	at all,	unless you need	some special configurations.  You may even
     omit the file as a	whole.	In such	cases, the rtadvd daemon will automat-
     ically configure itself using default values specified in the specifica-
     tion.

     It	obeys the famous termcap(5) file format.  Each line in the file
     describes a network interface.  Fields are	separated by a colon (`:'),
     and each field contains one capability description.  Lines	may be con-
     catenated by the `\' character.  The comment marker is the	`#' character.

CAPABILITIES
     Capabilities describe the value to	be filled into ICMPv6 router adver-
     tisement messages and to control rtadvd(8)	behavior.  Therefore, you are
     encouraged	to read	IETF neighbor discovery	documents if you would like to
     modify the	sample configuration file.

     Note that almost all items	have default values.  If you omit an item, the
     default value of the item will be used.

     There are two items which control the interval of sending router adver-
     tisements.	 These items can be omitted, then rtadvd will use the default
     values.

     maxinterval
	     (num) The maximum time allowed between sending unsolicited	multi-
	     cast router advertisements	(unit: seconds).  The default value is
	     600.  Its value must be no	less than 4 seconds and	no greater
	     than 1800 seconds.

     mininterval
	     (num) The minimum time allowed between sending unsolicited	multi-
	     cast router advertisements	(unit: seconds).  The default value is
	     the one third of value of maxinterval.  Its value must be no less
	     than 3 seconds and	no greater than	.75 * the value	of
	     maxinterval.

     The following items are for ICMPv6	router advertisement message header.
     These items can be	omitted, then rtadvd will use the default values.

     chlim   (num) The value for Cur Hop Limit field.  The default value is
	     64.

     raflags
	     (str or num) A 8-bit flags	field in router	advertisement message
	     header.  This field can be	specified either as a case-sensitive
	     string or as an integer.  A sting consists	of characters each of
	     which corresponds to a particular flag bit(s).  An	integer	should
	     be	the logical OR of all enabled bits.  Bit 7 ('m'	or 0x80) means
	     Managed address configuration flag	bit, and Bit 6 ('o' or 0x40)
	     means Other stateful configuration	flag bit.  Bit 4 (0x10)	and
	     Bit 3 (0x08) are used to encode router preference.	 Bits 01 (or
	     'h') means	high, 00 means medium, and 11 (or 'l') means low.
	     Bits 10 is	reserved, and must not be specified.  There is no
	     character to specify the medium preference	explicitly.  The
	     default value of the entire flag is 0 (or a null string,) which
	     means no additional configuration methods,	and the	medium router
	     preference.

     rltime  (num) Router lifetime field (unit:	seconds).  The value must be
	     either zero or between the	value of maxinterval and 9000.	When
	     rtadvd runs on a host, this value must explicitly set 0 on	all
	     the advertising interfaces	as described in	rtadvd(8).  The
	     default value is 1800.

     rtime   (num) Reachable time field	(unit: milliseconds).  The default
	     value is 0, which means unspecified by this router.

     retrans
	     (num) Retrans Timer field (unit: milliseconds).  The default
	     value is 0, which means unspecified by this router.

     The following items are for ICMPv6	prefix information option, which will
     be	attached to router advertisement header.  These	items can be omitted,
     then rtadvd will automatically get	appropriate prefixes from the kernel's
     routing table, and	advertise the prefixes with the	default	parameters.
     Keywords other than clockskew can be augmented with a number, like
     ``prefix2'', to specify multiple prefixes.

     clockskew
	     (num) Time	skew to	adjust link propagation	delays and clock skews
	     between routers on	the link (unit:	seconds).  This	value is used
	     in	consistency check for locally-configured and advertised	prefix
	     lifetimes,	and has	its meaning when the local router configures a
	     prefix on the link	with a lifetime	that decrements	in real	time.
	     If	the value is 0,	it means the consistency check will be skipped
	     for such prefixes.	 The default value is 0.

     prefixlen
	     (num) Prefix length field.	 The default value is 64.

     pinfoflags
	     (str or num) A 8-bit flags	field in prefix	information option.
	     This field	can be specified either	as a case-sensitive string or
	     as	an integer.  A sting consists of characters each of which cor-
	     responds to a particular flag bit(s).  An integer should be the
	     logical OR	of all enabled bits.  Bit 7 ('l' or 0x80) means	On-
	     link flag bit, and	Bit 6 ('a' or 0x40) means Autonomous address-
	     configuration flag	bit.  The default value	is "la"	or 0xc0, i.e.,
	     both bits are set.

     addr    (str) The address filled into Prefix field.  Since	``:'' is used
	     for termcap(5) file format	as well	as IPv6	numeric	address, the
	     field MUST	be quoted by doublequote character.

     vltime  (num) Valid lifetime field	(unit: seconds).  The default value is
	     2592000 (30 days).

     vltimedecr
	     (bool) This item means the	advertised valid lifetime will decre-
	     ment in real time,	which is disabled by default.

     pltime  (num) Preferred lifetime field (unit: seconds).  The default
	     value is 604800 (7	days).

     pltimedecr
	     (bool) This item means the	advertised preferred lifetime will
	     decrement in real time, which is disabled by default.

     The following item	is for ICMPv6 MTU option, which	will be	attached to
     router advertisement header.  This	item can be omitted, then rtadvd will
     use the default value.

     mtu     (num or str) MTU (maximum transmission unit) field.  If 0 is
	     specified,	it means that the option will not be included.	The
	     default value is 0.  If the special string	``auto'' is specified
	     for this item, MTU	option will be included	and its	value will be
	     set to the	interface MTU automatically.

     The following item	controls ICMPv6	source link-layer address option,
     which will	be attached to router advertisement header.  As	noted above,
     you can just omit the item, then rtadvd will use the default value.

     nolladdr
	     (bool) By default (if nolladdr is not specified), rtadvd(8) will
	     try to get	link-layer address for the interface from the kernel,
	     and attach	that in	source link-layer address option.  If this
	     capability	exists,	rtadvd(8) will not attach source link-layer
	     address option to router advertisement packets.

     The following item	controls ICMPv6	home agent information option, which
     was defined with mobile IPv6 support.  It will be attached	to router
     advertisement header just like other options do.

     hapref  (num) Specifies home agent	preference.  If	set to non-zero,
	     hatime must be present as well.

     hatime  (num) Specifies home agent	lifetime.

     When mobile IPv6 support is turned	on for rtadvd(8), advertisement	inter-
     val option	will be	attached to router advertisement packet, by configur-
     ing maxinterval explicitly.

     The following items are for ICMPv6	route information option, which	will
     be	attached to router advertisement header.  These	items are optional.
     Each items	can be augmented with number, like ``rtplen2'',	to specify
     multiple routes.

     rtprefix
	     (str) The prefix filled into the Prefix field of route informa-
	     tion option.  Since ``:'' is used for termcap(5) file format as
	     well as IPv6 numeric address, the field MUST be quoted by double-
	     quote character.

     rtplen  (num) Prefix length field in route	information option.  The
	     default value is 64.

     rtflags
	     (str or num) A 8-bit flags	field in route information option.
	     Currently only the	preference values are defined.	The notation
	     is	same as	that of	the raflags field.  Bit	4 (0x10) and Bit 3
	     (0x08) are	used to	encode the route preference for	the route.
	     The default value is 0x00,	i.e., medium preference.

     rtltime
	     (num) route lifetime field	in route information option.  (unit:
	     seconds).	Since the specification	does not define	the default
	     value of this item, the value for this item should	be specified
	     by	hand.  However,	rtadvd allows this item	to be unspecified, and
	     uses the router lifetime as the default value in such a case,
	     just for compatibility with an old	version	of the program.

     In	the above list,	each keyword beginning with ``rt'' could be replaced
     with the one beginning with ``rtr'' for backward compatibility reason.
     For example, rtrplen is accepted instead of rtplen.  However, keywords
     that start	with ``rtr'' have basically been obsoleted, and	should not be
     used any more.

     You can also refer	one line from another by using tc capability.  See
     termcap(5)	for details on the capability.

EXAMPLES
     As	presented above, all of	the advertised parameters have default values
     defined in	specifications,	and hence you usually do not have to set them
     by	hand, unless you need special non-default values.  It can cause	inter-
     operability problem if you	use an ill-configured parameter.

     To	override a configuration parameter, you	can specify the	parameter
     alone.  With the following	configuration, rtadvd(8) overrides the router
     lifetime parameter	for the	ne0 interface.

     ne0:\
	     :rltime#0:

     The following example manually configures prefixes	advertised from	the
     ef0 interface.  The configuration must be used with the -s	option to
     rtadvd(8).

     ef0:\
	     :addr="3ffe:501:ffff:1000::":prefixlen#64:

     The following example presents the	default	values in an explicit manner.
     The configuration is provided just	for reference purposes;	YOU DO NOT
     NEED TO HAVE IT AT	ALL.

     default:\
	     :chlim#64:raflags#0:rltime#1800:rtime#0:retrans#0:\
	     :pinfoflags="la":vltime#2592000:pltime#604800:mtu#0:
     ef0:\
	     :addr="3ffe:501:ffff:1000::":prefixlen#64:tc=default:

SEE ALSO
     termcap(5), rtadvd(8), rtsol(8)

     Thomas Narten, Erik Nordmark, and W. A. Simpson, Neighbor Discovery for
     IP	version	6 (IPv6), RFC 2461.

     Richard Draves, Default Router Preferences	and More-Specific Routes,
     draft-ietf-ipngwg-router-selection-xx.txt.

HISTORY
     The rtadvd(8) and the configuration file rtadvd.conf first	appeared in
     WIDE Hydrangea IPv6 protocol stack	kit.

FreeBSD	9.2			 May 17, 1998			   FreeBSD 9.2

NAME | DESCRIPTION | CAPABILITIES | EXAMPLES | SEE ALSO | HISTORY

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